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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Examination [Line Items]      
US federal tax rate 35.00%    
Unrecognized tax benefits $ 2,822,531 $ 2,822,531 $ 2,822,531
Income tax interest and penalties 0    
Tax years open to examination Years ended December 31, 2010 through December 31, 2013    
Adjustments to the federal tax returns 0    
Federal [Member]
     
Income Tax Examination [Line Items]      
Federal NOL carryforwards 61,516,000    
Federal credit carryforward 1,578,000    
State [Member]
     
Income Tax Examination [Line Items]      
Federal NOL carryforwards 27,325,000    
Federal credit carryforward $ 1,110,000    
Internal Revenue Service (IRS) [Member] | Minimum [Member]
     
Income Tax Examination [Line Items]      
Tax years under audit 2007    
Internal Revenue Service (IRS) [Member] | Maximum [Member]
     
Income Tax Examination [Line Items]      
Tax years under audit 2008